The net result will be you’ll wander through the game the second time feeling like your particular Shepard was originally from some gritty, grim alternate dimension where your character did dark things to survive. But it was all a dream! You didn’t let at least SIX* Bad Things happen that could have been averted! And not just the big stuff: I mean, there’s that one guy who doesn’t hate you now! It’s absurd, how much having that one guy not hate you makes a difference.